About 161 people are fighting the blaze and an additional aircraft was to be flown in to dump water on it today, Pipher said.

One helicopter was already being used to dump water on the fire Thursday.

Allen Chrisman, commander of the Type II team from Idaho brought in to fight the fire, said firefighters thought they were getting close to containment until Thursday.

"Before yesterday the fire was lying around waiting for us to put it out," he said Friday morning from a temporary base camp set up at Colorado Northwestern Community College in Rangely. "We didn't have the helicopter we needed to dump water and the fire decided it had laid around long enough."

Containment for the fire was projected to be Saturday, but that has been pushed back to Monday due to the rough day Thursday.

"We expect the same conditions today with the humidity dropping down to 10 percent," he said. "We will probably have to pull back again. It's going to take in some more acres but we hope to hold it in place."

Monday containment is possible, he said.

"We probably have better than a 50 percent chance of having it contained," he said. "It all depends on what happens today."

About eight crews and six engines are on the fire, Chrisman said.

Resources are sufficient, he said, but the focus is still on other fires burning in other parts of the state.

"We're fairly low priority because there are no communities or structures nearby," he said.

Authorities at Dinosaur National Monument are still investigating the cause of a 2,000-acre fire burning near the east entrance of the park in Northwest Moffat County.

Projected containment for the Dinosaur fire is also Monday, said Bruce Fields, fire management officer for Dinosaur National Monument. About 50 people are fighting the fire, including a Type III team from California and a Type II team from North Dakota.

Fields said the Yampa Bench Road at the east end of the park is closed, but the rest of the park is open for visitors this weekend.

No structures are in danger and no cattle is grazing in the area in which the fire is burning, Fields said.

A fire ban has been in place at Dinosaur National Monument for about three weeks, and Fields said visitors are warned that fire danger is extreme throughout the monument.